US10036327B2 - Damper with bent neck for gas turbine - Google Patents

Damper with bent neck for gas turbine Download PDF

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Publication number
US10036327B2
US10036327B2 US14/523,040 US201414523040A US10036327B2 US 10036327 B2 US10036327 B2 US 10036327B2 US 201414523040 A US201414523040 A US 201414523040A US 10036327 B2 US10036327 B2 US 10036327B2
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Prior art keywords
neck
damper
flow
chamber
grazing
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US14/523,040
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US20150113992A1 (en
Inventor
Devis TONON
Mirko Ruben Bothien
Franklin Marie GENIN
Douglas Anthony Pennell
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Ansaldo Energia Switzerland AG
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Ansaldo Energia Switzerland AG
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Assigned to ALSTOM TECHNOLOGY LTD reassignment ALSTOM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PENNELL, DOUGLAS ANTHONY, BOTHIEN, MIRKO RUBEN, Genin, Franklin Marie, TONON, DEVIS
Publication of US20150113992A1 publication Critical patent/US20150113992A1/en
Assigned to GENERAL ELECTRIC TECHNOLOGY GMBH reassignment GENERAL ELECTRIC TECHNOLOGY GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ALSTOM TECHNOLOGY LTD
Assigned to Ansaldo Energia Switzerland AG reassignment Ansaldo Energia Switzerland AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GENERAL ELECTRIC TECHNOLOGY GMBH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24—Heat or noise insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/002—Wall structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • F05D2260/963—Preventing, counteracting or reducing vibration or noise by Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/00014—Reducing thermo-acoustic vibrations by passive means, e.g. by Helmholtz resonators

Definitions

  • the present invention relates to a gas turbine, in particular to a damper for reducing the combustion dynamics in a chamber of a gas turbine.
  • the combustion dynamics here includes but not limit to pulsations, acoustic oscillations, pressure and velocity fluctuations and noise.
  • the chamber of a gas turbine here includes not only combustion chamber, but also air channels, plenums and the like where combustion dynamic exist.
  • acoustic oscillation usually occurs in the chambers of the gas turbines.
  • the term chamber means any gas volume where combustion dynamics exist.
  • a gas for example a mixture of fuel and air or exhaust gas
  • Burning air and fuel in the combustion chamber causes further noises.
  • This acoustic oscillation may evolve into highly pronounced resonance.
  • Such oscillation which is also known as combustion chamber pulsations, can assume amplitudes and associated pressure fluctuations that subject the combustion chamber itself to severe mechanical loads that may decisively reduce the life of the combustion chamber and, in the worst case, may even lead to destruction of the combustion chamber.
  • acoustic damping devices like a Helmholtz resonator, a half-wave tube, a quarter-wave tube or other types of damping devices.
  • FIG. 1 schematically shows the arrangement of a conventional Helmholtz resonator.
  • the Helmholtz resonator 10 comprises a resonator cavity 11 connected to the chamber 14 via a neck 12 .
  • the neck 12 includes a mouth 13 at its outlet end.
  • the chamber 14 is only partially shown in FIG. 1 with the inner surface 15 of the chamber.
  • the principle of the Helmholtz resonator is given herein.
  • the resonator cavity 11 acts as a spring for air expansion and contraction in the cavity.
  • the air in the neck 12 behaves as a mass connected to the spring.
  • This system has one or more resonance frequencies. When acoustic waves are at a frequency close to one of the resonance frequencies of the damper and impinge the mouth of the neck, the damper reduces or damps such pulsations.
  • the mass of air oscillates due to the spring effect of the cavity.
  • the oscillation of the air through the neck triggers vortex shedding at the neck. In this way, acoustic energy is converted into aerodynamic energy which ultimately dissipates into heat. Enhanced dissipation is often introduced by means of a flow of gas through the damper neck. This is referred to through flow or bias flow.
  • the gas flow inside the chamber flowing across the mouth 13 of the neck 12 (referred to as grazing flow in the following description) will affect the damping performance.
  • grazing flow the gas flow inside the chamber flowing across the mouth 13 of the neck 12
  • bias flow the gas flow inside the chamber flowing across the mouth 13 of the neck 12
  • the damper has a detrimental effect on the damper performance.
  • current solution is to arrange the damper in the regions of the chamber where the velocity of the grazing flow is not so high compared to the bias flow velocity.
  • the preferred damper location is in regions subjected to high grazing flow velocity.
  • a damper for reducing the pulsations in a chamber of a gas turbine, wherein the damper comprises a resonator cavity and a neck in flow communication with the resonator cavity and the chamber, wherein the neck includes a mouth to communicate with the chamber, wherein air flow inside the chamber flows across the mouth of the neck.
  • the neck is so configured that the longitudinal axis of its mouth is angled 0°-90° relative to the direction of the air flow inside the chamber. The geometry of such neck will induce a flow distribution at the mouth that reduces or eliminate the detrimental effect of the grazing flow on the damping performances.
  • the neck protrudes into the chamber and is bent along the direction of the air flow inside the chamber, wherein the longitudinal axis of the mouth of the neck is formed in 0°-90° relative to the direction of the air flow inside the chamber.
  • the neck protrudes into the chamber and is bent with the longitudinal axis of its mouth in alignment with the direction of the air flow inside the chamber. That is, the neck is bent along the direction of the air flow so that the longitudinal axis of the mouth is configured to 0° relative to the direction of said flow.
  • the neck protrudes into the chamber and is bent with the longitudinal axis of its mouth in 90° relative to the direction of the air flow inside the chamber.
  • the neck is formed as a slanted channel with the longitudinal axis thereof in acute angle relative to the direction of the grazing flow inside the chamber.
  • This slanted neck will modify the fluid dynamic interaction of the bias flow leaving the mouth with the grazing flow. This modifies the tendency of the grazing flow to restrict the passage of the bias flow that leaves the neck of the damper. This has the effect of modifying the effect of the grazing flow on the acoustic properties of the damper.
  • the mouth of the neck is covered on one side by a shield that deflects the flow through the neck in a direction parallel to the direction of the flow inside the chamber.
  • the damper of present invention may include a Helmholtz resonator with one or more damping volumes, a half-wave tube, a quarter-wave tube, a multi-volume damper, a liner or any kind of acoustic flow through damper.
  • the damping performance is not affected by the strong grazing flows inside the combustion chamber.
  • FIG. 1 shows a schematic view of the damper and combustion chamber in prior art
  • FIG. 2 shows a schematic view of the first embodiment of the invention
  • FIG. 3 shows a schematic plan view of the first embodiment of the invention
  • FIG. 4 shows a schematic view of the second embodiment of the invention
  • FIG. 5 shows a schematic plan view of the second embodiment of the invention
  • FIG. 6 shows a schematic view of the third embodiment of the invention.
  • FIG. 7 shows a schematic view of the fourth embodiment of the invention.
  • FIG. 1 shows the arrangement of a conventional damper 10 used in a gas turbine, which is already described in the above.
  • the grazing flow 30 i.e., the gas flow inside the chamber 14 , flows across the mouth 13 of the neck 12 .
  • the bias flow 20 i.e., the gas flow through the neck 12 , goes into the chamber 14 perpendicular to the grazing flow 30 .
  • the inventors have found through tests that the increase of the ratio between grazing flow compared to the bias flow tends to restrict the passage of the bias flow that leaves the neck of the damper. Thus the damping performance of the damper will be significantly reduced.
  • FIG. 2 shows a first embodiment of the present invention.
  • a damper 10 is arranged for reducing the pulsations in a chamber 14 of a gas turbine.
  • the damper 10 comprises a resonator cavity 11 and a neck 12 .
  • the neck 12 is in flow communication with the resonator cavity 11 and the interior of the chamber 14 .
  • the neck 12 includes a mouth 13 to communicate with the chamber 14 .
  • the gas flow inside the chamber 14 i.e., the grazing flow 30 , flows across the mouth 13 of the neck 12 , and the gas flow, i.e., the bias flow 20 , may go through the neck 12 .
  • the neck 12 protrudes into the chamber 14 .
  • the neck 12 is so bent that the longitudinal axis of its mouth 13 is in alignment with the direction of the grazing flow 30 . That is, the neck 12 is bent along the flow direction of the grazing flow 30 so that the longitudinal axis of the mouth 13 is configured to 0° relative to the direction of the grazing flow 30 .
  • the longitudinal axis of the mouth 13 is configured to 0° relative to the direction of the grazing flow 30 , it is readily known to those skilled in the art that the alternatives with a small angle relative to the direction of the grazing flow 30 are equivalent to the first embodiment.
  • FIG. 3 shows a planned view of the damper 10 in FIG. 2 .
  • the curves above and below the neck 12 in FIG. 3 schematically show the air flow region of the grazing flow 30 .
  • the neck 12 protrudes into the grazing flow region of the chamber 14 and is bent along the direction of the grazing flow 30 , in case of sufficiently high velocities of the grazing flow, the neck 12 leads to a separation of the grazing flow 30 and the consequent formation of a low grazing flow velocity region as shown by the curves in FIG. 3 .
  • the detrimental interference of the grazing flow 30 to the bias flow 20 out of the neck 12 is further alleviated and the damping performance is improved.
  • the detrimental effect of the grazing flow on the bias flow can be first reduced by the alignment of the bias flow with the grazing flow through the configuration of the mouth 13 of the neck 12 in the damper 10 . Further, as the neck 12 will deflect the grazing flow and create a region of low grazing flow velocity around the mouth 13 , it gives an additional help to reduce the detrimental effect of the grazing flow on the acoustic properties.
  • FIG. 4 shows a second embodiment of the present invention.
  • the basic structure of the damper 10 in the second embodiment is similar to that in the first embodiment.
  • the neck 12 also protrudes into the chamber 14 .
  • the difference from the first embodiment is that the neck 12 is bent with the longitudinal axis of its mouth in 90° relative to the direction of the grazing flow 30 . More particular, as shown in FIG. 4 , the neck 12 is bent in clockwise direction and formed to 90° relative to the grazing flow direction.
  • the longitudinal axis of the mouth 13 is configured to 90° relative to the direction of the grazing flow 30 , it is readily known to those skilled in the art that the alternatives with the angle a little bit more or less than 90° relative to the direction of the grazing flow 30 are equivalent to the second embodiment and thus also covered by the present invention.
  • FIG. 5 shows a planned view of the damper 10 in FIG. 4 .
  • the neck 12 protrudes into the grazing flow region of the chamber 14 and is bent so that, in case of sufficiently high velocities of the grazing flow, the neck 12 leads to a separation of the grazing flow and the consequent formation of a low grazing flow velocity region, as shown by the curves in FIG. 5 . This helps to reduce the detrimental effect of the grazing flow on the acoustic properties.
  • the first and second embodiments above respectively limit a damper 10 with the neck 12 protruded into the chamber 14 and bent with the longitudinal axis of its mouth 13 in 0° and 90° relative to the direction of the grazing flow 30 . It is readily known by those skilled in the art that a neck protruded into the combustion chamber and bent along the grazing flow direction with the longitudinal axis of the mouth 13 between 0° and 90° relative to the grazing flow direction could also achieve the objective of the present invention and thus be covered by the present invention.
  • FIG. 6 shows a third embodiment of the present invention.
  • the neck 12 does not protrude into the chamber 14 but it is formed as a slanted channel to communicate the resonator cavity 11 and the interior of the chamber 14 .
  • the neck 12 is so formed that the longitudinal axis thereof is in acute angle relative to the grazing flow direction.
  • This slanted neck will modify the fluid dynamic interaction of the bias flow 20 leaving the mouth 13 with the grazing flow 30 .
  • This modifies the tendency of the grazing flow to restrict the passage of the bias flow that leaves the neck of the damper, and thus alleviate the effect of the grazing flow 30 on the acoustic properties of the damper 12 so the damping performance is improved.
  • FIG. 7 shows a fourth embodiment of the present invention.
  • the basic configuration is similar, i.e., the neck 12 is in communication with the resonator cavity 11 and the chamber 14 .
  • the mouth 13 of the neck 12 will be covered on one side by a shield 16 that deflects the bias flow 20 in a direction parallel to the grazing flow 30 which flows across the neck 12 .
  • the volume between the inner surface 15 of the combustion chamber 14 and the shield 16 acts as a part of the neck 12 .
  • the damper in the present invention includes Helmholtz resonators with one or more damping volumes, also includes a half-wave tube, a quarter-wave tube, a multi volume damper, a liner or any kind of acoustic flow through damper that is known from the art.
  • the chamber mentioned in the present invention may be a combustor chamber, a mixing chamber, air channels, plenums and the like where combustion dynamic exists.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
US14/523,040 2013-10-28 2014-10-24 Damper with bent neck for gas turbine Active 2037-01-25 US10036327B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13190439.3 2013-10-28
EP13190439 2013-10-28
EP13190439 2013-10-28

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US20150113992A1 US20150113992A1 (en) 2015-04-30
US10036327B2 true US10036327B2 (en) 2018-07-31

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EP (1) EP2865947B1 (ja)
JP (1) JP2015086877A (ja)
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Cited By (1)

* Cited by examiner, † Cited by third party
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US20180128483A1 (en) * 2013-05-24 2018-05-10 Ansaldo Energia Ip Uk Limited Damper for gas turbine

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FR3042541B1 (fr) 2015-10-20 2019-08-09 Airbus Helicopters Conduit d'ejection de gaz a traitement acoustique, aeronef et procede de fabrication d'un tel conduit
JP6815735B2 (ja) 2016-03-03 2021-01-20 三菱パワー株式会社 音響装置、ガスタービン
US10228138B2 (en) 2016-12-02 2019-03-12 General Electric Company System and apparatus for gas turbine combustor inner cap and resonating tubes
US10220474B2 (en) 2016-12-02 2019-03-05 General Electricd Company Method and apparatus for gas turbine combustor inner cap and high frequency acoustic dampers
US10221769B2 (en) 2016-12-02 2019-03-05 General Electric Company System and apparatus for gas turbine combustor inner cap and extended resonating tubes
EP3410014B1 (en) * 2017-05-31 2021-01-20 Ansaldo Energia S.p.A. Tile holder for a combustor of a gas turbine
JP6978912B2 (ja) * 2017-11-29 2021-12-08 三菱パワー株式会社 燃焼器及びガスタービン
US11156164B2 (en) 2019-05-21 2021-10-26 General Electric Company System and method for high frequency accoustic dampers with caps
US11174792B2 (en) 2019-05-21 2021-11-16 General Electric Company System and method for high frequency acoustic dampers with baffles
US11506382B2 (en) 2019-09-12 2022-11-22 General Electric Company System and method for acoustic dampers with multiple volumes in a combustion chamber front panel
US11788724B1 (en) * 2022-09-02 2023-10-17 General Electric Company Acoustic damper for combustor

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EP0576717A1 (de) 1992-07-03 1994-01-05 Abb Research Ltd. Gasturbinen-Brennkammer
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180128483A1 (en) * 2013-05-24 2018-05-10 Ansaldo Energia Ip Uk Limited Damper for gas turbine
US10260745B2 (en) * 2013-05-24 2019-04-16 Ansaldo Energia Ip Uk Limited Damper for gas turbine

Also Published As

Publication number Publication date
CN104566457A (zh) 2015-04-29
JP2015086877A (ja) 2015-05-07
EP2865947A1 (en) 2015-04-29
CN104566457B (zh) 2019-02-26
EP2865947B1 (en) 2017-08-23
US20150113992A1 (en) 2015-04-30

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